My Daedric parrying katana has a 250 points enchantment. :D Of course it's not originally in the game, it's a plugin.

Another good reason to search the strongholds across the land, is that in 4 of em, you'll find the mastertrainers for Alchemy, Axe, Enchant, and Marksmanship. I'm not gonna spoil you with the strongholds names, that's for you to figure out, but it's worth the effort.